Granted Patent
Utility
US 6,818,799 · App. 10/418,193
Process for removing tar from spent acid
Inventors:
Richard Liu, Philip Hill, Thomas Edwin Pruitt, Forrest Lee Sanders, Albert Yi Yang
Patented Case
View Patent ↗
Granted: Nov 16, 2004
Filed: Apr 17, 2003
Inventors
Richard Liu
Philip Hill
Thomas Edwin Pruitt
Forrest Lee Sanders
Albert Yi Yang
Assignee (at issue)
Rhodia, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.